The Yellowstone Under Fire:

How a Wartime Flood Brought Bombs to Miles City, Montana

The winter of 1943-44 settled hard across southeastern Montana. In Miles City, the seat of Custer County and a ranching hub on the high plains east of the Tongue River’s confluence with the Yellowstone, residents endured the cold with the particular patience of communities long accustomed to the river’s moods. Miles City had been shaped by geography and military necessity since its founding in the aftermath of the Little Bighorn. The city took its name from General Nelson Miles, commander of Fort Keogh, around which the town coalesced in the 1870s and 1880's, while Fort Keogh itself memorialized Captain Myles Keogh, killed at the Battle of the Little Bighorn.  By 1944, that military lineage was more than history: the nation was nearly three years into the Second World War, and even a ranching town of roughly seven thousand people knew the shape of sacrifice. What residents could not have anticipated was that the war’s industrial machinery — the bombers, the ordnance, the chain of command from Colorado Springs to the Dakota badlands — would shortly be turned not against an enemy but against their own frozen river.

The event that came to be called, with some local pride, the bombing of Miles City was not an act of war. It was an act of desperation, one that drew on the only resource the wartime United States had in conspicuous abundance: military aviation and the bombs it could carry.

The Flood of March 1944

The crisis began unremarkably. The weekend of March 17 and 18, 1944 was typical for Miles City. Residents tuned to radio station KRJF, attended the local theaters showing light musical entertainments, and discussed the upcoming high school basketball tournament to be held in Great Falls.  The Tongue River, draining the mountains near the Montana-Wyoming border, was running high, and its ice flows were joining those already thickening in the Yellowstone’s main channel. By Sunday evening, the situation had moved past routine.

Ice flows from the rising Tongue River joined those already accumulating in the Yellowstone. The resulting ice jam caused a rapid rise in river water, and by late Sunday evening, residents on the north side of the city were warned to evacuate. Sheriff, police, and fire department personnel worked through the night while KRJF broadcast continuous updates. 

The Yellowstone River reached 19.3 feet, more than three feet above flood stage and approximately fifteen feet above its normal level.  The ice, acting as a dam, had formed a lake more than a mile wide across the northern part of the city. Approximately three hundred families were rendered homeless within hours of the freeze, and more were likely to suffer the same fate.  Boats moved through what had been residential streets. A Red Cross disaster relief center opened in a local school. The road to Jordan, the remote seat of Garfield County to the north, was cut off entirely.

Monday morning, with the water too deep to wade through, men and boats continued rescuing marooned families. Water inundated Hubble Street, cutting off the road to Jordan. Twenty miles south and upstream from town, high waters were forcing ice flows over a Tongue River dam. 

From Dynamite to Flying Fortress

Mayor Leighton Keye, confronting a disaster that municipal resources could not address alone, reached first for an improvised solution. With assistance from Colstrip explosives experts and permission from the Civil Aeronautics Administration, the mayor enlisted local pilots Brud Foster, Fred Cook, and Ted Filbrandt. After reconnaissance flights over the river, the men fused and dropped close to twelve boxes, or 1,500 pounds, of dynamite into the ice-choked channel. The resulting blasts were only partly successful in clearing the ice flows. 

The situation required a different order of force. Keye contacted the Rapid City Army Air Base in South Dakota, only to be told that thick fog in the Black Hills prevented any aircraft from taking off. He then appealed upward through the state’s government. The aircraft was ultimately ordered out by Second Air Force Headquarters at Colorado Springs, Colorado, following a request for aid by Montana Governor Sam C. Ford.  The request, as it circulated through channels, was terse and direct: send in the bombers.

The B-17 Flying Fortress assigned to the mission was piloted by Major Richard Ezzard, the Rapid City Air Base’s director of flying, with a crew of ten others.  The bomber carried a load of 250-pound demolition charges — ordnance designed for European and Pacific targets now adapted to an eastern Montana river channel. Taking off through blizzard conditions, a hazardous undertaking in any era of aviation, the crew made their way across the Dakota badlands toward the Yellowstone.

Forced to fly at just 2,600 feet rather than the previously planned 10,000 feet because of a gathering storm system to the northwest, Major Ezzard dropped the first bomb just downstream from the 7th Street Bridge.  Crowds of residents, kept at a distance of at least a mile from the drop zone as a safety precaution, watched the aircraft bank and circle over the river. During four runs, the crew dropped over fifteen 250-pound bombs into the ice-packed Yellowstone. 

Per the Associated Press, water and bomb-shattered chunks of ice surged down the Yellowstone River just moments after the bombing run concluded.  The jam broke. The river, after days of threatening to consume the city, began to recede.

Immediately following the bombing, the Yellowstone’s waters began receding, preventing further danger and flood damage. No human lives were lost to the flood, and livestock losses were believed to be minimal.  The following morning, water levels had dropped ten feet from their peak. City crews pumped out a substantial share of the basements of between three hundred and five hundred evacuated homes. Roughly one hundred evacuees attended clinics to discuss contaminated wells and home repairs before returning to their properties.

Mayor Keye described the mission as “perfect and in accordance with the best traditions” of the United States Military.  The crew of the B-17, their unusual wartime assignment complete, spent the night as guests of the relieved community, treated to accommodations at the local hotel. The next morning the crew departed, and the B-17 made a final pass low over the town at fifty feet above the rooftops, rocking its wings as it flew back to Rapid City. 

Montana’s Wartime Skies: The Threat No One Could Discuss

The river bombing was the most visible wartime aviation event to touch Miles City, but it was not the only time during those years that the skies over Montana carried an unusual threat. Beginning in late 1944, simultaneously with Miles City’s return to something like normalcy, the Imperial Japanese Army was directing a different kind of aerial weapon toward the American West — weapons that, unlike the B-17 over the Yellowstone, were expressly designed to kill.

Operation Fu-Go was an incendiary balloon weapon deployed by Japan against the United States during World War II. It consisted of a hydrogen-filled paper balloon 33 feet in diameter, with a payload of four 11-pound incendiary devices and one 33-pound high-explosive anti-personnel bomb. The uncontrolled balloons were carried over the Pacific Ocean from Japan to North America by the jet stream, using a sophisticated sandbag ballast system to maintain altitude. 

Between November 1944 and April 1945, the Japanese military launched more than 9,000 of the pilotless weapons in the operation codenamed Fu-Go. Most fell harmlessly into the Pacific Ocean, but more than 300 of the white paper spheres made the 5,000-mile crossing and were spotted over the western United States and Canada. 

Montana was among the states where Fu-Go balloons were found or observed. On December 11, 1944, an intact Fu-Go balloon was found in the forest near Coram, northeast of Kalispell, Montana. Two loggers discovered it in a forested area. The FBI and Army Air Force arrived to study the strange contraption, 33 and a half feet wide and made of laminated paper. Writing on the balloon identified its Japanese origin and indicated it had been completed only weeks earlier at a Japanese factory.  The find in Kalispell was one of the earliest confirmed recoveries in the continental United States, and it gave military investigators crucial early evidence of the balloon program’s scope.

The codeword “paper” was adopted within the Bureau of Indian Affairs and Army reporting networks for balloon bomb reports. A report of “paper” over the Yellowstone country would travel upward through a strictly controlled telephone chain, so that confirmation of a balloon landing near the Pryor Mountains or other points in eastern Montana required the regional BIA forester to make several calls to the United States Army. 

After an Associated Press article in December 1944 revealed that FBI and military personnel were investigating a balloon in Montana, the Military Intelligence Service sent a message to all public press requesting they refrain from mentioning balloon incidents. Aside from a few articles published in small local newspapers, the voluntary censorship policy proved quite successful.  The silence was strategic: if Japan learned its balloons were reaching American soil, the program might be expanded or recalibrated. As long as American media cooperated, the Japanese remained uncertain whether their weapon was working at all.

Japanese officers later told the Associated Press that they had finally decided the weapon was worthless and the whole experiment useless, because they had repeatedly monitored radio broadcasts and heard no mention of the balloons.  The censorship, in effect, defeated the weapon. In the end, Operation Fu-Go did not achieve any of its operational goals. The principal objective, to set fire to the North American forests, was undermined from the beginning by the weather — the most favorable winds occurred in winter, when the forests were normally at their wettest and often snow-covered, and the winter of 1944-45 was North America’s wettest of the decade. 

The most tragic Fu-Go incident occurred far from Montana. On May 5, 1945, six civilians were killed near Bly, Oregon — a minister’s pregnant wife and five children on a picnic who stumbled upon an unexploded device. They were the only civilians to die by enemy weapons on the United States mainland during World War II. 

A Town Built for Crisis

The bombing of Miles City and the covert threat of Japanese balloons drifting over Montana’s plains were, in their different registers, expressions of a single historical reality: even in the interior West, remote from every recognized theater of the war, the conflict had altered the texture of ordinary life. Miles City had been a military town since its founding, shaped by the campaigns of the 1870s and the administrative apparatus of Fort Keogh. Its proximity to the Yellowstone River had made it a logical location for a frontier military post in the late nineteenth century. Over time, the need for a garrison waned, but the people remained, and Miles City became a hub for ranchers throughout the region.  The same river that had sustained the post and the town now threatened to reclaim it.

The wartime bombing of the Yellowstone illustrated something about the nature of military capacity in 1944. A community in a flood emergency could, within forty-eight hours, summon a four-engined heavy bomber from a neighboring state, drop several tons of high explosives on a river ice jam, and return to something approaching normalcy. The chain of authority — mayor to governor to Second Air Force Headquarters — moved with a speed that reflected both the genuine gravity of the flood and the wartime readiness of military aviation infrastructure across the interior West.

By the end of the week following the bombing, life in Miles City was returning to normal. Weekend movie options included “Edge of Darkness” with Errol Flynn and the musical “Sing a Jingle.” Sadly, the Miles City Cowboys failed to place in the Basketball Championship after losing to Stanford 51 to 48.  The Yellowstone, indifferent to the war and to the town built beside it, ran on.

Aftermath and Memory

The bombing of the Yellowstone ice jam in March 1944 left no lasting physical mark, which may partly explain why it has occupied a minor place in the historical memory of eastern Montana. It does not appear in most general accounts of the state’s wartime history, and it received only regional press coverage at the time, overshadowed by the larger events of a global conflict.

The Japanese balloon campaign, for its part, remained largely unknown to the American public until after the war’s end, when censorship restrictions were lifted. Nearly thirty known locations where Japanese balloon bombs landed in Montana have been documented, with finds scattered across the state from Blaine County to the Crow Indian Reservation and beyond.  The Crow Agency records, held at the National Archives at Denver, contain contemporaneous documentation of balloon sightings and reporting procedures that illuminate the administrative seriousness with which the threat was treated even in remote corners of the West.

Together, these two episodes — the friendly bombing of the Yellowstone and the silent passage of Japanese Fu-Go devices over Montana’s plains — constitute a small but historically specific chapter in the domestic experience of the Second World War: the moment when the technologies and organizational logics of a global conflict briefly intersected with the seasonal crises and daily routines of a ranching town in southeastern Montana.

Works Cited

“Bombing of Yellowstone Is Effective.” Miles City Daily Star, 23 Mar. 1944, p. 3. [Primary newspaper source, held in the Montana Historical Society Research Center, Helena, MT.]

Coen, Ross. Fu-Go: The Curious History of Japan’s Balloon Bomb Attack on America. University of Nebraska Press, 2014.

“Flood Waters Reach Into City.” Miles City Daily Star, 21 Mar. 1944, pp. 1, 3. [Primary newspaper source, Montana Historical Society Research Center, Helena, MT.]

Harmon, Jim. “Kaboom! Wartime Explosions Rock Miles City, Baker.” Missoula Current, 5 Dec. 2022, missoulacurrent.com/miles-city-baker-explosions/. Accessed 18 May 2026. [Citing Fallon County Times, 23 Mar. 1944, as primary source.]

Mikesh, Robert C. Japan’s World War II Balloon Bomb Attacks on North America. Smithsonian Institution Press, 1973. [Smithsonian Annals of Flight, No. 9.]

Powles, James M. “Terror from the Sky: Japan’s Balloon Bomb Offensive.” World War II, vol. 18, no. 3, 2003, pp. 38-44.

Stoltz, Zoe Ann. “Bombs over the Yellowstone! Or, How Custer County Breaks up Ice Jams.” Montana History Revealed: Behind the Scenes at the Montana Historical Society, Montana Historical Society, 9 Mar. 2017, mthistoryrevealed.blogspot.com/2017/03/bombs-over-yellowstone-or-how-custer.html. Accessed 18 May 2026. [Citing Miles City Daily Star issues of March 1944 as primary sources.]

“The War Comes to the Reservation: The Japanese Balloon Bombs of WWII.” Prologue: The Journal of the National Archives, National Archives and Records Administration, 6 May 2025, text-message.blogs.archives.gov/2025/05/06/the-war-comes-to-the-reservation-the-japanese-balloon-bombs-of-wwii/. Accessed 18 May 2026. [Drawing on records of the Crow Indian Agency, National Archives at Denver, file “680.7 Re: Japanese Balloon Menace and Protection.”]

“Yellowstone, Tongue Floods Recede; Storm Prevents Bombers from Helping to Break Up Blocks of Ice.” The Independent Record [Helena, MT], 21 Mar. 1944, p. 3. [Primary newspaper source.]